#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<unistd.h>
#include<signal.h>
#include<sys/wait.h>
#include<arpa/inet.h>
#include<sys/socket.h>
#define BUF_SIZE 30
void error_handling(char *message);
void read_routine(int sock,char *buf);
void write_routine(int sock,char *buf);
//并发客户端
int main(int argc,char *argv[])
{
	int sock;
	struct sockaddr_in serv_adr;
	pid_t pid;
	char buf[BUF_SIZE];
	if(argc!=3)
	{
		printf("Usage:%s<IP><port>\n",argv[0]);
		exit(1);
	}
	sock=socket(PF_INET,SOCK_STREAM,0);
	memset(&serv_adr,0,sizeof(serv_adr));
	serv_adr.sin_family=AF_INET;
	serv_adr.sin_addr.s_addr=inet_addr(argv[1]);
	serv_adr.sin_port=htons(atoi(argv[2]));
	if(connect(sock,(struct sockaddr*)&serv_adr,sizeof(serv_adr))==-1)
		error_handling("connect() error");
	pid=fork();
	if(pid==0)
		write_routine(sock,buf);
	else
		read_routine(sock,buf);
	close(sock);		
	return 0;
}
void read_routine(int sock,char *buf)
{
	while(1)
	{
		int str_len=read(sock,buf,BUF_SIZE);
		if(str_len==0)
			return;
		buf[str_len]=0;
		printf("Message from server:%s",buf);
	}
}
void write_routine(int sock,char *buf)
{
	while(1)
	{
		//fputs("Input message(Q to quit):",stdout);
		fgets(buf,BUF_SIZE,stdin);
		if(!strcmp(buf,"q\n")||!strcmp(buf,"Q\n"))
		{
			shutdown(sock,SHUT_WR);
			return;
		}
		write(sock,buf,strlen(buf));
	}
}
void error_handling(char *message)
{
	fputs(message,stderr);
	fputc('\n',stderr);
	exit(1);
}
